IMDG Amendment 42-24: What Changed for Dangerous Goods by Sea

The International Maritime Dangerous Goods Code is revised on a two-year cycle, and each amendment ripples through the documentation, packaging and stowage of every regulated shipment by sea. The current edition is mandatory now — voluntary application during the transition window is over.

Why the cycle matters

The IMDG Code is the global rulebook for moving hazardous cargo by sea, harmonised with the UN Model Regulations. When it updates, so do the requirements behind your dangerous-goods declaration, the marks and labels on the packaging, and the segregation rules that govern what can stow near what. A shipment prepared to the previous edition can be refused at the terminal.

The practical pressure points

Amendments typically touch a few recurring areas: new or reclassified UN numbers, revised packing instructions, updated provisions for lithium batteries and other fast-evolving hazards, and refinements to segregation tables. None of these are dramatic in isolation, but each one can invalidate a declaration that was perfectly correct a cycle ago.

The detail that detains a container is almost never exotic — it is a label, a packing instruction or a segregation rule that quietly changed editions.

Who needs to act

Anyone shipping Class 1–9 goods by sea should confirm their declarations, packaging specs and handler training reflect the current edition. The safest path is to have a certified DG specialist review the MSDS, confirm the classification against the live code, and file the declaration with the booking — so the cargo is accepted first time rather than bounced at the quay.

References

• IMO — IMDG Code
• IMO — Carriage of Dangerous Goods